At first, I thought this was interesting. And then I read the part about the battery only lasting for a few weeks, before it must be recharged. This sounds ter

At first, I thought this was interesting. And then I read the part about the battery only lasting for a few weeks, before it must be recharged. This sounds terribly inefficient. I recall reading about a spring type of battery made of diamond nano fibers a few weeks ago. They were saying this was even more efficient than lithium ions, since it was a physical process of releasing its energy, instead of a chemical process. It behaves like a child’s wind up toy, but at the molecular level. Would it be better instead to have a physical battery, instead of a chemical battery? Perhaps something like a big wind up spring can be built. Then it can hold its charge indefinitely. And you stack thousands of these together, and they can just sit there for a long time, until they are needed. Or even that idea to use large cement blocks stacked into skyscrapers. Each block holds potential energy, and when released, it can glide down a magnetic track and generate electrical energy. This is also a concept of a physical battery. Even a hydroelectric dam is physical energy. You’re moving the water uphill.